Weighting unit for fiber attenuating apparatus



1960 c. H. WILLIAMS ETAL WEIGHTING UNIT FOR FIBER ATTENUATING APPARATUS4 Sheets-Sheet 1 Filed June 25, 195G C/ur/lon. ll. [WI/111m: Burre/ C. C0/:

A BY

A'H'omeys IN VEN TOR.

Feb. 16, 1960 g. H. WILLIAMS ETAL- 2,924,855

' wmcmmc UNIT FOR FIBER ATTENUATING APPARATUS Filed June 25, 1956 4Sheets-Sheet 3 v IN V EN TOR. C/za r/fon HWi/ln'ans BY Burre/ C. CaleA'Horaeys 1960 c. H. WILLIAMS ETAL 2,924,855 A A WEIGHTING UNIT FORFIBER ATTENUATING APPARATUS Filed June 25, 1956 4 Sheets-Sheet 4 INVENT(bar/fan h. Will/a BY Burre/ C. Cole 6 xmme s V United States PatentCharlton H. Williams and Barrel C. Cole, Columbus, Ga; said Coleassignor to said Williams Application June 25, 1956, Serial No. 593,630

9 Claims. (Cl. 19-136) This invention relates to a weight unit for fiberattenuating apparatus'and more particularly to saddles and springweighting units therefor for weighing top rolls against driven lowerline rolls of fiber attenuating apparatus, such as spinning frames,rolling frames and the like.

An object of our invention is to provide a weighting unit of thecharacter designated which shall include positioning means associatedwith the back line top roll which controls the location of the pivotalconnection of the saddle lever for the front and middle linetop rolls,thus permitting any normal ratio of weight to be applied to the criticalfront and middle line top rolls, regardless of roll spread or'theoverall weight desired, and without materially affecting the ratio ofweight applied to the non-critical back line top roll.

A more specific object of our invention is to provide positioning meansof the character designated which shall be simple of construction andadjustment and fully enclosed without the exposure of threads or otherparts to attract lint.

A further object of our invention is to provide positioning means of thecharacter designated which does not require the application of lubricantto the contact areas between the weighting unit and the front, middleand back line rolls and in which the contact portions of the weightingunit may be simple and inexpensive to replace after excessive wear.

A further object of our invention is to provide a self-containedadjustable spring weighting unit which shall be adapted for installationon conventional type frames to replace the loops, levers, hooks andgravity weigh-ts now employed.

A further object of our invention is to provide a spring weighting unitwhich shall be adapted for installation wholly above the frame and inmost cases may be installed on the roll beam by using the same threadedhole now employed for the loop of the gravity system.

A further object of our invention is to provide a combined saddlestirrup and a weighting unit which may be released or latched entirelyfrom the front or rear thus resulting in a material saving in man-hoursoperation, frame cleaning and frame repairs,

A still further object of our invention is to provide a spring weightingunit in which the spring tension. adjustment is independent of thestirrup adjustment, whereby any desired weighting may be applied in auniform manner throughout the frameby gauging the distance between thehousing. for the spring and the part actuated by the spring.

As is well known in the, art to which our invention re.-.

lates, roll spreads must be adjusted to accommodate the materials orfiber lengths being, processed and the applied weight for bestperformance varies with the 2,924,855 Patented Feb- 16, 19.60

ice

particular drafting system employed and with the speeds of therespective lines which create the draft. Conventional-type saddles donot permit proper weight distribution to the respective lines of toprolls and unless oil impregnated wood or a synthetic material isemployed on the saddles for contact with the rolls, constant lubricationis required. Also, if one or more of such contacts are employed forlubricating the saddle, excessive wear will affect the Weightdistribution. Difii culties have also been encountered in theapplication of weight to the saddles of conventional type fiberattenuating apparatus due to'the fact that the usual weight hook andgravity Weight hung thereon does not provide for accurate application ofweight to the plurality of saddles on the frame. To increase or decreasethe weight applied, it is necessary either to change the levers or thepivot points thereon or change the weights. The weights also aidconsiderably to the overall weight of the frame.

To overcome the above and othere difliculties, we provide a saddle withfixed pivot points and a single adjustment that will permit any desiredratio of Weighting on the front, middle and back line rolls. This ad:justment is provided by a positioning bracket which is adapted foradjustment relative to the saddle and contacts the back line roll,thereby controlling the location of the pivot for the saddle lever whichapplies weight to both the front and middle line rolls. An adjustablespring weighting unit is employed-in place of the conventional typegravity weighting mechanism and a single adjustment thereof controls theoverall weighting on the saddle stirrup. Also, the spring Weighting unitis self-contained and is adapted for installation on con.- ventionaltype frames without alteration.

Apparatus embodying features of our invention is i1.- lustrated in theaccompanying drawings, forming a part of this application, in which:

Fig. 1 is a plan view, partly broken away and in se'c tion, showing themanner in which our improved weighting unit is mounted on fiberattenuating apparatus;

Fig. 2 is a sectional view taken generally along the line II-II of Fig.1;

Fig. 3 is a sectional view taken along the. line lIIIII of Fig. 2;

Fig. 4 is a sectional view taken generally along the line IVIV of Fig.2;

Fig. 5 is an exploded view of the saddle mechanism and the stirruptherefor; I

Fig. 6 is a fragmental sectional view, with parts omitted for the sakeof clarity, and showing a modified form of saddle construction;

Fig. 7 is a side elevational view, partly in section, showing a modifiedform of weighting unit; and,

Fig. 8 is a sectional view taken generally along the line VIIL-VHI ofFig. 7. 1

Referring now to the drawings for a better understanding of ourinvention, we show fiber attenuating apparatus having front, middle andback linetop roll assemblies, 10, 11 and 12, respectively. The middleline top roll assembly llmay have an apron 13 which passes over a roll14' and an upper apron nose bar 16. Mounted beneath the top line rollassemblies are lower front, middle and back line roll assemblies 17, 18and 19,

respectively. The. lower middle line assembly 13 may be provided with anapron 21 which passes over a roll' 22 and a lower apron nose bar 23. Thefiber attenating apparatus shown is also provided with the usual rollbeam 24, cap bars 26 and clearer roll assembly 27, as shown.

Our improved saddle assembly embodies a main saddle lever 28 which maybe formed of a single strip of material bent on itself as at 29 toprovide laterally spaced side members 31 and 32 which extend rearwardlysubstantially parallel to each other. Mounted for pivotal movementintermediate its ends at the forward end of the saddle lever 28 by meansof a pivot pin 33in a second sa ddle lever 34. The second saddle lever34 comprises a U-shaped bracket36 having suitable transverse openingstherein for receiving the pivot pin 33. A suitable opening is providedin the base of the U-shaped bracket 36 for receiving a screw 37 whichsecures relatively flat elongated members 38 and 39 in place, as shownin Fig. 2. The elongated members 38 and 39 extend across the front andmiddle line top roll assemblies and are provided with openings 41 and 42therein, respectively, for receiving the screw 37. Preferably, the

elongated member 39 is formed of a suitable bearing material, such aslignum-vitai or of a synthetic material and is provided with recesses 43adjacent the ends thereof for receiving cooperating depressions 44formed at the ends of the elongated member 38, thereby maintaining themembers 38 and 39 in alignment with each other and permitting the lowermember 39 to be turned over when the lower bearing surface thereofbecomes worn.

Projecting upwardly between the side members 31 and 32 adjacent the rearends thereof is a positioning bracket 46 which is reduced in thicknessas at 47 whereby the upper portion thereof fits slidably between therear portions of the side members 31 and 32. The reduced' portion 47 onthe positioning bracket defines horizontal shoulders 48 and 49 which arein position to engage the under surface of the side members 31 and 32whereby the rear ends of the side members are supported by thepositioning bracket. Elongated longitudinally extending openings 51 and52 are provided in the side members 31 and 32 adjacent the rear endsthereof and a suitable opening 53 is provided in the portion 47 of thepositioning bracket 46 for receiving a bolt 54. The bolt 54 is locked inselective positions along the elongated slots 51 and 52 by means of anut 56 and lock washer 57.- The lower surface of the positioning bracket46 is recessed as at 58 to accommodate itself to the radius of the backline top roll assembly 12, as shown in Fig. 2. Preferably, thepositioning bracket 46 is formed of a material which requires nolubrication, such as lignum-vitai or synthetic bearing materials. Itwill thus be seen that by adjusting the location of the saddle lever 28along the positioning bracket 46, the relative position of the pivot pin33 to the front and middle top roll assemblies may be varied, it beingunderstood that positioning bracket 46 remains in a stationary positionon back line top. roll assembly 12 after initially positioned thereon.

Extending upwardly between the side members 31 and 32 of the saddlelever 28 and pivotally connected thereto by means of a pivot pin 59 is astirrup 61. The upper end of the stirrup 61 is provided with anextension 62 which preferably extends upwardly and forwardly of thepivot pin 59, whereby the lower end of the stirrup 61 may be movedrearwardly by depressing the extension 62.

The lower end of the stirrup 61 is provided with a. hook-like member 63which is adapted to engage a notch 64 formed in a lever arm 66. Mountedon the roll beam 24 by any suitable means, such as by a cap screw 67, isan upstanding bracket 68 having laterally spaced side walls 69 and 71.The lever 66 extends between the side walls 69 and 71, as shown in Fig.4, and is pivotally connected thereby by means of a pivot pin 72. Asshown in Fig. 2, the lever 66 is substantially L-shaped as viewed inside elevation and extends forwardly of the roll beam 24. Preferably, ahandle portion 73 is provided at the forward end of the lever 66.

As shown in Fig. 2, the bracket 68 is provided with a downturned flange74 at the rear end thereof which extends downwardly alongside the rollbeam 24 whereby the 4 bracket 68 is maintained in proper alignment withthe roll'beam. To adjust the vertical position of the bracket 68 so asto accommodate different length stirrup units, we provide a spacermember 76 having an elongated longitudinally extending slot 77 thereinfor receiving the cap screw 67, as shown. By varying the thickness ofthe spacer member 76, the bracket 68 may be moved to the desiredelevation.

Pivotally connected to the lever 66 by means of a pin 78 is one end ofan actuating rod 79. The other end of the rod 79 is threaded as at 81for receiving a nut 82 having an annular shoulder 83 adjacent the outerend thereof. Preferably, the shoulder 83 is knurled to facilitateturning of the nut 82 by hand. Attached to the upstanding bracket 68 byany suitable means and surrounding the rod 79 is a cylindrical housing84 having an inturned annular flange 86 at the lower end thereof.Positioned within the housing 84 and contacting the inner surface of theannular flange 86 is a washer 87. Surrounding the rod 79 between thewasher 87 and the nut 82 is a compression type spring 88 which urges thenut 82 and the actuating rod 79 rearwardly, thereby urging the lever 66in a direction to move the saddle stirrup 61 downwardly toward operativeposition. Due to the fact that the pivotal connection of the rod 79 tothe lever 66 is at a substantially greater distance from the pivot 72than is the notch 64, a considerable force is exerted by the spring 88to urge the stirrup 61 downward. To adjust the tension of the spring 88,the nut 82 is rotated in the proper direction and is locked in adjustedposition by means of a lock nut 89. The annular shoulder 83 on the nut82 also provides an index member whereby the position of the nut 82relative to the housing 84 may be measured, thus permitting identicalpressures to be applied to all of the spring weigh-ting units of thefiber attenuating apparatus.

To facilitate insertion of the hook portion 63 of the stirrup 61 betweenthe side walls 69 and 71, of the upturned bracket 68 and into engagementwith the notch 64 of the lever 66, the forward ends of the side walls 69and 71 are flared outwardly as at 91 and 92. Also, as shown in dottedlines in Fig. 2, the stirrup 61 is so constructed that, when released,it hangs by gravity out of engagement with the notch 64.

Fromthe foregoing description, the operation of our improved weightingunit will be readily understood. The side members 31 and 32 are movedrelative to the positioning bracket 46 to position the pivot pin 33 ofthe saddle member 34 at the proper location between the front and middleline top roll assemblies. The positioning bracket 46 is then locked'inthis adjusted position by means of the bolt 54 and lock nut 56.

The upstanding bracket 68 is secured to the roll beam 24 with the properwidth spacer member 76 beneath the same to accommodate the upstandingbracket to the length of the stirrup 61. The downturned flange 74engages the rear side of the roll beam 24 thus maintaining properalignment of the bracket 68. The nut 82 is moved in the proper directionto apply the correct tension to the spring 88. By adjusting one nut 82to the proper position whereby the desired tension is applied to thespring 88, all units on the frame may be set to the same weight bygauging the distance between the ends of the cylinders 84 and theannular shoulders 83 on the nuts 82.

Due to the fact that the stirrup 61 is so balanced about the pivot pin59 that the hook portion thereof normally hangs out of engagement withthe notch 64, the hook portion 63 may be easily engaged with the notch64 by pressing down on the extension 62 while the forward end of thelever 66 is raised. After the hook-like portion 63 has engaged the notch64 the forward end of the lever 66 is released, thus locking thehook-like member 63 within the notch 64. To disengage the hooklikemember 63 and the notch 64, the forward end of the lever 66 is raisedwhereupon the lower end of the stirrup 61 swings. by gravity out ofengagement. with the notch 64. The provision of the outwardly flaredportions on the side walls 69 and 71 of the upstanding bracket 68 aidsin the movement of the hook portion 63 into and out of engagement withthe notch 64. It will be noted that the'inner portions of the side walls69 and "71 adjacent the outwardly flared portions 91 and 92 are slightlyfurther apart than the thickness of the stirrup 61 and the lever 66. t

In Fig. 6 ofthe drawings, we show a modified form of saddle constructionwhich is adapted for use with a nebless antifriction front line top roll10a to maintain it in alignment with middle and back line top rollassemblies 11a and 12a, respectively. Our improved saddle assembly shownin Fig. 6 embodies a main saddle lever 28a whichis preferably formed ofa single strip of material bent on itself as at 29a to provide laterallyspaced side members which are similar in all respect to the side members31 and 32, described here-to-fore. Also, the saddle lever 28a carries apositioning bracket 46a which engages an annular recess 45 formed in theback line top roll assembly 1211 and is similar in all respects to thepositioning bracket 46.

Mounted for pivotal movement intermediate its ends at the forward end ofthe saddle lever 28a by means of a pivot pin 33a is a second saddlelever 34a comprising a base 94 having upturned flanges 99 at the sidesthereof adapted to engage the sides of the lever 28a whereby the saddlelevers 28a and 34a are maintained in alignment with each other. Securedto the undersurface of the'base 94 of the saddle lever 34a by means of ascrew 93 is a relatively flat elongated member 96 which extendsrearwardly across the middle line top roll assembly 11a and engages anannular recess 95 in the roll assembly 11a, as shown. The elongatedmember 96 is provided with a recess 97 adjacent the rear end thereof forreceiving a cooperating depression 98 formed at the rear end of the base94, thereby maintaining the member 96 in alignment with the lever 34aand permitting the member .96 to be turned over when the lower bearingsurface thereof becomes worn.

The upturned flanges 99 extend forwardly of the base 94 and are providedwith elongated, longitudinally extending slots 101 for receiving anadjusting bolt 102 which passes through both flanges 99.

Projecting upwardly between the forwardly extending portions of theflanges 99 is a positioning bracket 103 which is similar in constructionto the positioning bracket 46a. The lower surface of the positioningbracket 103 is recessed as at 104 to accommodate itself to the radius ofthe front line top roll assembly 10a, and is provided with a groove 104afor receiving an annular bead 100 formed on the shaft of the front linetop roll assembly 10a. The groove 104a extends in a vertical planesubstantially normal to the middle and back line top rolls whereby thenebless front line top roll is maintained in alignment with the middleand back line top rolls.

The operation of the saddle assembly shown in Fig. 6 is similar to thatof the saddle assemblies shown in Figs.

1 through 5. The rear end of the saddle lever 28a is adjusted alongpositioning bracket 46a to locate the pivot pin 33a at the properposition between the front and middle line top roll assemblies 10a and11a.

With the positioning bracket 46a and the rear end of the elongatedmember 96 positioned within the recesses 45 and 95 respectively, thesaddle-lever 340: extends in a direction normal to the rolls of theassemblies 11a and 12a. The annular bead 100 engages the groove 104a inthe bracket 10 3 whereby the front line top roll is maintained inparallel alignment with the middle and back line top rolls as the weightis applied directly to the front line top roll through the bracket 103.To vary the position of the bracket 103 relative to the pin 33a, thebracket 103 is moved along the forward end of the saddle lever 34a tothe desired location and is then locked in place by means of theadjusting bolt 102.

By providing the positioning bracket 103, which is ad justable relativeto the saddle lever 34a, in combination with the elongated member 96,which slidably engages the middle line roll assembly 11a, the saddlemechanism may be readily adjusted to apply the desired ratio of weightto the roll assemblies regardless of roll spread of the draftingapparatus.

In Figs. 7 and 8 we show a'modified form of spring weighting unit whichis adapted for release from the rear of the frame. Mounted on the rollbeam 24a by means of a cap screw 67a is an upstanding U-shaped bracket63a which is provided with an elongated slot 106 therein for receivingthe cap screw 67a whereby the position of the bracket 68a relative tothe roll beam 24a may be adjusted. A suitable spacer member 76a havingan elongated, longitudinally extending slot 77a therein is providedbetween the roll beam 24a and the bracket 68a whereby the bracket 68amay be moved to the desired elevationto accommodate stirrups ofdifferent lengths.

Fivotally connected to the bracket 68a by means of a pivot pin 72a is arearwardly extending lever arm 66a having a handle member 73a at therear end thereof. As shown in Fig. 7, the lever arm 66a is alsosubstantially L shaped and pivotally connected to the lower end thereofby means of a pivot pin 78a is an actuating rod 79a of a springweighting unit indicated generally at 107. The spring weighting unit 107is substantially identical in construction and operation to the springweighting unit associated with the apparatus shown'in Figs. 1 to 5. Thelever arm 66a is provided with a notch 64d; adjacent the pivot pin 72afor engaging the lower hook-like member 63a of a stirrup 61a.

The operation of the'spring weight unit shown in Figs. 7 and 8 issubstantially identical to that of the spring weighting 'unit disclosedin Figs. 1 to 5, the principal difference being that the lever arm 66aextends rearwardly of the frame rather than forwardly thereof.

From the foregoing, it will be seen that we have devised an improvedweighting unit for fiber attenuating apparatus which is simple ofconstruction and operation and which reduces greatly the time requiredto engage and disengage the'weighting unit. This is particularly true inview of the fact that the release and application of weight is fromeither the front or rear of the apparatus and no part of the apparatusfalls apart during such release and application of weight. A furtheradvantage lies in the fact that the entire weighting unit is mountedabove the roll beam. Alsofby providing a single adjustment in the formof a positioning bracket which contacts the back line top roll, theratio of weighting on the rolls is accurately controlled regardless ofroll spreads. Furthermore, 'by providing a single spring adjustmentwhich controls the overall weighting of the saddle stirrup, theapplication of weight on the stirrup may be adjusted accurately in aminimum of time.

While we have shown our invention in several forms it will be obvious tothose skilled in the art that it is not so limited but is susceptible ofvarious other changes and modifications without departing from thespirit thereof, and we desired, therefore, that only such limitationsshall be placed thereupon as are specifically set forth in the appendedclaims.

What we'claim is: 1. In a weighting unit for fiber attenuating .apparatuhaving front, middle and back line top rolls, a stirrup, a first saddlelever pivotally connected intermediate its ends to the upper end of saidstirrup, a second saddle l ever pivotally connected intermediate itsends adjacent the forward end of said first saddle lever, said secondsaddle lever having a lower flat surface in supporting contact with thef om an m d l 11 1 t @91 5 nd par b t ea versely o the rolls n a an enea l pa a e ta P ane passing through the "longitudinal axis of boththeffront and middle line top rolls, a positioning bracket adapted toengage the back line top roll, adjustable means connecting the rear endof said first saddle lever at selected positions along said positioningbracket whereby the pivotal connection between the saddle levers may belocated at selected positions between the front and middle line toprolls, a hook-like member adjacent the lower end of said stirrup, anoutwardly extending actuating lever releasably connected to saidhook-like member, and means urging said lever in a direction to urgesaid stirrup toward operative position.

2. A weighting unit ,as defined in claim 1 in which the stirrup isnormally suspended by gravity whereby the hook-like member is out ofengagement with said actuating lever and the upper end of the stirrup isprovided with an extension whereby the lower end of the stirrup may bemoved into engagement with said actuating lever.

3. In a weighting unit for fiber attenuating apparatus having front,middle and back line top rolls, a stirrup, a first saddle lever havingelongated laterally spaced side members extending substantially parallelto each other and pivotally connected intermediate their ends to saidstirrup, a second saddle lever pivotally connected intermediate its endsadjacent the forward ends of said side members, said second saddle leverhaving a lower fiat surface in supporting contact with the front andmiddle line top rolls and movable transversely of the rolls in a planegenerally parallel to a plane passing through the longitudinal axis ofboth the front and middle line top rolls, a positioning bracket adaptedto engage the back line top roll, the upper portion of said positioningbracket being reduced in thickness to fit slidably between said sidemembers adjacent the rear ends thereof and defining shoulders forsupporting the rear ends of the side members, and releasable meansattaching said bracket to said side members at selected positionswherebythepivotal connection between the saddle levers may be located atselected positions between the first and middle line top rolls.

4. A weighting unit as defined in claim 3 in which the releasable meansattaching the positioning bracket to the side members comprises asecuring bolt, there being longitudinally extending slots in said sidemembers and an opening through said bracket for receiving said bolt. 5.In a weighting unit for fiber attenuating apparatus having front, middleand back line top rolls, a stirrup, a first saddle lever pivotallyconnected intermediate its ends to said stirrup, a second saddle leverpivotally connected intermediate its ends adjacent the forward end ofsaid first saddle lever and comprising at least one relatively flatmember in bearing contact with and extending across the front and middleline top rolls for transmitting pressure thereto, said second saddlelever being movable transversely of the rolls in a plane generallyparallel to a plane passing through the longitudinal axis of both thefront and middle line top rolls by the sliding of said flat membertransversely of the rolls, a positioning bracket adapted to engage theback line top roll, and adjustable means connecting the rear end of saidfirst saddle lever at selected positions along said positioning bracketwhereby the pivotal connection between the saddle levers may be locatedat selected positions between the front and middle line top rolls.

6. In a weighting unit for fiber attenuating apparatus having front,middle and back line top rolls, a stirrup, a first saddle leverpivotally connected intermediate its ends to said stirrup, a secondsaddle lever pivotally connected intermediate its ends adjacent theforward end of said first saddle lever and comprising two relativelyflat members adapted to extend across the front and middle line toprolls with one member positioned above the other, releasable meanssecuring said members to each other, one of said members having recessestherein and the other having depressions therein disposed to cooperatewith saidrecesses whereby said members are maintained in a firstsaddlelever pivotally connected intermediate itsv ends to said stirrup, asecond saddle lever pivotally connected intermediate its ends adjacentthe forward end of said first saddle lever and adapted to extend acrossthe front and middle line top rolls, a positioning bracket adapted toengage the back line top roll, adjustable means connecting the rear endof said first saddle lever at selected positions along said positioningbracket whereby the pivotal connection between the saddle levers may belocated at selected positions between the front and middle line toprolls, a second positioning bracket adapted to engage the front line toproll and having an alignment member cooperating with an annularlydisposed member on the frontline top roll whereby said front line toproll is maintained in substantially parallel alignment with the middleand back line top rolls, and adjustable means connecting said secondpositioning bracket at selected positions along the forward end of saidsecond saddle lever.

8. In a weighting unit for fiber attenuating apparatus having front,middle and back line top rolls, a stirrup, a first saddle leverpivotally connected intermediate its ends to said stirrup, a secondsaddle lever pivotally connected intermediate its ends adjacent theforward end of said first saddle lever and adapted to extend across thefront and middle line top'rolls, a positioning bracket adapted to engagethe back line top roll, adjustable means connecting the rear end of saidfirst saddle lever at selected positions along said positioning bracketwhereby the pivoted connection between the saddle levers may be locatedat selected positions between the front and middle line top rolls, asecond positioning bracket engaging said front line top roll and havinga groove extending in a vertical plane substantially normal to themiddle and back line top rolls, an annular beadon said front line toproll in position to fit in said groove whereby the front line top rollis maintained substantially in parallel alignment with the middle andback line rolls, and adjustable means connecting said second positioningbracket at selected positions along the forward end of said secondsaddle lever.

9. In a weighting unit for fiber attenuating apparatus having front,middle and back line top rolls, a stirrup, a first saddle leverpivotally connected intermediate its ends to said stirrup, a secondsaddle lever pivotally connected intermediate its ends adjacent theforward end of said first saddle lever, said'second saddle leverextending between and having supporting bearing surfaces on said frontand middle line top rolls for transmitting pressure thereto, at leastone of the supporting surfaces having a fiat bearing surface in slidingcontact with one of said top rolls and said second lever being movabletransversely of the rolls along said flat bearing surface in a planegenerally parallel to a plane passing through the longitudinal axis ofboth the front and middle line top rolls, said first 1ever being movabletransversely of the rolls with the move ment of said second lever in aplane generally parallel I (References on following page) ReferencesCited in the file of this patent UNITED STATES PATENTS 1,837,926Toenniessen Dec. 22, 1931 2,224,105 Repass Dec. 3, 1940 2,496,765Williams Feb. 7, 1950

